New Zealand Prime Minister Jacinda Ardern on Thursday made a shock announcement she had "no more in the tank" to continue leading the country and would leave office no later than early February and not seek re-election. Ardern, holding back tears, said that it had been a tough five and a half years as prime minister and that she was only human and needed to step aside. "This summer, I had hoped to find a way to prepare for not just another year, but another term - because that is what this year requires. I have not been able to do that," Ardern, 42, told a news conference. "I know there will be much discussion in the aftermath of this decision as to what the so called 'real' reason was... The only interesting angle you will find is that after going on six years of some big challenges, that I am human," she continued. "Politicians are human. We give all that we can, for as long as we can, and then it's time. And for me, it’s time." A ruling New Zealand Labor Party vote for a new leader will take place on Sunday; the party leader will be prime minister until the next general election. Ardern's term as leader will conclude no later than Feb. 7 and a general election will be held on Oct. 14. Ardern said she believed Labor would win the upcoming election. New Zealand Deputy Prime Minister Grant Robertson, who also serves as finance minister, said in a statement he would not seek to stand as the next Labor leader. Ardern became an inspiration to women around the world after winning the top job in 2017 at the relatively young age of 37. The following year, she became just the second world leader to give birth while holding office. When she brought her infant daughter to the floor of the UN General Assembly in New York in 2018, it brought smiles to people everywhere. In March 2019, Ardern faced one of the darkest days in New Zealand’s history when a white supremacist gunman stormed two mosques in Christchurch and slaughtered 51 people. She was widely praised for the way she embraced the survivors and New Zealand’s Muslim community in the aftermath. She was lauded globally for her country’s initial handling of the coronavirus pandemic after New Zealand managed for months to stop the virus at its borders. But she was forced to abandon that zero-tolerance strategy as more contagious variants spread and vaccines became widely available. Ardern faced growing anger at home from those who opposed coronavirus mandates and rules. A protest last year that began on Parliament’s grounds lasted for more than three weeks and ended with protesters hurling rocks at police and setting fires to tents and mattresses as they were forced to leave.